/*
 * Copyright (c) 2011-2022, baomidou (jobob@qq.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.baomidou.mybatisplus.core.conditions.segments;

import cn.hutool.core.util.BooleanUtil;
import com.baomidou.mybatisplus.core.conditions.ISqlSegment;
import com.baomidou.mybatisplus.core.enums.SqlKeyword;
import com.particle.global.tool.thread.ThreadContextTool;

import java.util.List;
import java.util.stream.Collectors;

/**
 * 普通片段
 *
 * @author miemie
 * @since 2018-06-27
 */
@SuppressWarnings("serial")
public class NormalSegmentList extends AbstractISegmentList {

	/**
	 * 是否处理了的上个 not
	 */
	private boolean executeNot = true;

	NormalSegmentList() {
		this.flushLastValue = true;
	}

	@Override
	protected boolean transformList(List<ISqlSegment> list, ISqlSegment firstSegment, ISqlSegment lastSegment) {
		if (list.size() == 1) {
			/* 只有 and() 以及 or() 以及 not() 会进入 */
			if (!MatchSegment.NOT.match(firstSegment)) {
				//不是 not
				if (isEmpty()) {
					//sqlSegment是 and 或者 or 并且在第一位,不继续执行
					return false;
				}
				boolean matchLastAnd = MatchSegment.AND.match(lastValue);
				boolean matchLastOr = MatchSegment.OR.match(lastValue);
				if (matchLastAnd || matchLastOr) {
					//上次最后一个值是 and 或者 or
					if (matchLastAnd && MatchSegment.AND.match(firstSegment)) {
						return false;
					} else if (matchLastOr && MatchSegment.OR.match(firstSegment)) {
						return false;
					} else {
						//和上次的不一样
						removeAndFlushLast();
					}
				}
			} else {
				executeNot = false;
				return false;
			}
		} else {
			if (MatchSegment.APPLY.match(firstSegment)) {
				list.remove(0);
			}
			if (!MatchSegment.AND_OR.match(lastValue) && !isEmpty()) {
				add(SqlKeyword.AND);
			}
			if (!executeNot) {
				list.add(0, SqlKeyword.NOT);
				executeNot = true;
			}
		}
		return true;
	}

	@Override
	protected String childrenSqlSegment() {
		if (MatchSegment.AND_OR.match(lastValue)) {
			removeAndFlushLast();
		}
		final String str = this.stream().map(ISqlSegment::getSqlSegment).collect(Collectors.joining(SPACE));
		Object nested = ThreadContextTool.get("nested");
		if (BooleanUtil.isTrue(((Boolean) nested))) {
			return (LEFT_BRACKET + str + RIGHT_BRACKET);
		}
		return (  str );
	}

	@Override
	public void clear() {
		super.clear();
		flushLastValue = true;
		executeNot = true;
	}
}
